US5051866A - Power circuit device for an image-forming apparatus - Google Patents

Power circuit device for an image-forming apparatus Download PDF

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Publication number
US5051866A
US5051866A US07/441,288 US44128889A US5051866A US 5051866 A US5051866 A US 5051866A US 44128889 A US44128889 A US 44128889A US 5051866 A US5051866 A US 5051866A
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United States
Prior art keywords
circuit device
power circuit
slender
power
elongated
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Expired - Lifetime
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US07/441,288
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English (en)
Inventor
Haruya Osaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Mita Industrial Co Ltd
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Mita Industrial Co Ltd
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Application filed by Mita Industrial Co Ltd filed Critical Mita Industrial Co Ltd
Assigned to MITA INDUSTRIAL CO., LTD. reassignment MITA INDUSTRIAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OSAKA, HARUYA
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/209—Heat transfer by conduction from internal heat source to heat radiating structure

Definitions

  • the present invention relates to a power circuit device, and more particularly to a power circuit device suitable to be suitably used for an image forming apparatus such as an electrophotographic copying apparatus or the like.
  • a power circuit in an electrophotographic copying apparatus generally includes elements which emit heat more or less (hereinafter referred to heat emitting elements) such as resistors, transistors, diodes and the like. Thus, radiator plates are often required.
  • the power circuit is housed in a limited space in an electrophotographic copying apparatus. Accordingly, the power circuit is apt to be designed such that the printed circuit board thereof is reduced in area. To enhance the radiation effect, the radiator plates are suitably disposed on the printed circuit board at required positions thereof, and the heat emitting elements are attached to the radiator plates. As a result, the power circuit device may be reduced in volume, and the radiation effect may be improved.
  • radiator plates 2, 3 having great heat capacity, are respectively disposed at both lateral sides of a printed circuit board 1.
  • the conventional power circuit device has been designed based on the concept that it is the best to reduce the entire volume of the power circuit device to make the same in a small size, thereby to enhance the general-purpose properties thereof.
  • the printed circuit board is generally made in the form of a regular square or a rectangle, close to a regular square.
  • a custom space for housing the power circuit device should be formed in the apparatus, since the power circuit device is made in the form of a cube or a rectangular parallelpiped, close to a cube, even though the power circuit device is made in a small size.
  • the electrophotographic copying apparatus includes a number of mechanisms required for image forming processing. It has been, therefore, difficult to provide in a electrophotographic copying apparatus a large space for housing the power circuit device, with the layout of such image forming processing mechanisms taken into consideration. To obtain a space for housing the power circuit device in the electrophotographic copying apparatus, it is inevitably required to increase the volume of the electrophotographic copying apparatus. This presents the problem that the apparatus is increased in size.
  • a projecting portion 5, as shown in FIG. 6, may be disposed at the back of an electrophotographic copying apparatus 6.
  • the projecting portion 5 is provided in the wall surface thereof with radiating slits 7.
  • the arrangement including such a projecting portion 5 presents the problem that the electrophotographic copying apparatus requires a wider installation space in a room.
  • the radiation effect should be enhanced even though the entire volume of the device is small. Accordingly, thick radiator plates 2, 3 having great heat capacity should be disposed. With the increase in the number of heat emitting elements, the capacity or volume of the radiator plates must inevitably be increased. Accordingly, the radiator plates become expensive, resulting in an increase in cost of the power circuit device.
  • the electrophotographic copying apparatus incorporates complicated image forming processing mechanisms. However, some gaps are locally present in the apparatus. Such gaps are generally long and narrow vacant spaces.
  • the conventional power circuit device is made in the form of a cube or a rectangular parallelpiped, close to a cube even though it is made in a small size. Accordingly, the conventional power circuit device cannot be housed in any of these long and narrow vacant spaces.
  • an automatic assembling apparatus should move in a wider range for securing and wiring heat emitting elements to the printed circuit board. This results in increase in size and cost of the automatic assembling apparatus.
  • the slender power circuit device has many faults and no advantages, those skilled in the art, or the persons concerned, have not taken such a device into consideration.
  • a slender power circuit device may be disposed in the electrophotographic copying apparatus within one of the vacant spaces therein, and effectively used without requiring a special place. This results in reduction in the size of the electrophotographic copying apparatus.
  • the power input unit, the power output unit and a plurality of heat emitting elements requiring a radiator plate are wired to a printed circuit board.
  • the radiator plate is formed in a slender shape of which length is such that a plurality of heat emitting elements are attached to the radiator plate at necessary spatial intervals.
  • the printed circuit board is formed in a slender shape the length of which corresponds to the length of the radiator plate.
  • the power input unit is disposed at one longitudinal end of the slender printed circuit board, and the power output unit is disposed at the other longitudinal end of the slender printed circuit board, so that the power input unit and the power output unit are sufficiently separated from each other.
  • the above power circuit device is generally slender, so that the power circuit device may be incorporated in apparatus such as an electrophotographic copying apparatus or the like with a vacant space therein, making efficient use of such vacant space. Moreover, since the radiator plate included in the power circuit device is also slender, a plurality of heat emitting elements requiring the radiator plate may be attached thereto as arranged substantially in one row.
  • a vacant space in apparatus in which the power circuit device is incorporated may be used efficiently.
  • the apparatus requires no special space for housing the power circuit device, enabling the apparatus to be reduced in size in its entirety.
  • the printed circuit board is formed in a slender shape fit for the radiator plate. Accordingly, the power input unit and the power output unit disposed at the printed circuit board may be sufficiently separated from each other at both ends of the board. Since the power input unit and the power output unit are sufficiently separated from each other on the circuit board, the interference of the output side and the input side with each other in the circuit may be reduced, resulting in reduction in power noise.
  • the radiator plate may be attached directly to the body of apparatus.
  • the heat of the radiator plate may be efficiently transmitted to the apparatus body.
  • a thin radiator plate may be used.
  • FIG. 1 is a perspective view of a power circuit device in accordance with an embodiment of the present invention, illustrating how the power circuit device is attached to the base of apparatus;
  • FIG. 2 schematically shows the space in an electrophotographic copying apparatus which is occupied by the power circuit device of the present invention installed in the apparatus;
  • FIG. 3 schematically illustrates an air cooling action exerted on the power circuit device
  • FIG. 4 schematically illustrates another example of the installation of the power circuit device
  • FIG. 5 is a perspective view of a conventional power circuit device
  • FIG. 6 is a schematic view of a conventional power circuit device externally attached to the body of an electrophotographic copying apparatus.
  • this embodiment is characterized in that the power circuit device is made in the form of a slender shape in its entirety. That is, the power circuit device has, as will be discussed later, a printed circuit board and a radiator plate, both of which are formed in a slender shape.
  • a power circuit device 20 includes a slender printed circuit board 21 and aslender radiator plate 22 which is disposed along one of the long edges of the printed circuit board 21 and at a right angle thereto.
  • An input connector 23 is disposed on the printed circuit board 21 at one longitudinal end thereof, and output connectors 24 are disposed on the printed circuit board 21 at the other longitudinal end thereof.
  • the input connector 23 and the output connectors 24 are separated from each other on the slender printed circuit board 21 at both longitudinal ends thereof. This prevents the input wires and the output wires from getting close to each other in the inside wiring of the electrophotographic copying apparatus or in the wiring pattern of the printed circuit board 21. This reduces power noise to improve the noise-resisting properties of the electrophotographic copying apparatus.
  • the slender radiator plate 22 Attached to the slender radiator plate 22 are heat emitting elements such as an AC input diode bridge 25, switching transistors 26, 27, 28, a hybridIC 29, output transistors 30, 31 and the like which are arranged in one rowat necessary spatial intervals.
  • the radiator plate 22 has asufficient length such that a plurality of heat emitting elements 25 to 31 requiring the radiator plate 22 may be attached as arranged in one row, and the radiator plate 22 has a minimized narrow width.
  • the power circuit device 20 is formed, in its entirety, in a slender shape having an L-shape section.
  • the radiator plate 22 may be attached directly to a base 40 of an apparatus with screws 41, 42, 43. Accordingly, the heat of the radiator plate 22 is efficiently transmitted to the base 40.
  • the radiator plate 22 to be economically made of an aluminium plate or the like of which thickness is smaller than a conventional one. Thus, a power circuit device having a great capacity may be made with lessmaterial cost.
  • the printed circuit board 21 may be made by longitudinally connecting a plurality of, for example two or three, printed circuit boards, instead of the use of a single slender board in FIG. 1.
  • the power circuit device 20 in accordance with this embodiment is intentionally made in a slender shape, so that the power circuit device 20 may be housed in one of slender gaps, i.e., slender vacant spaces, locally present in the body 10 of the electrophotographic copying apparatus, as schematically shown in FIG. 2 (A) or FIG. 2 (B).
  • a document cover and an operation and display panel are respectively designated by reference numerals 51 and 52.
  • the power circuit device 20 may be housed in a slender vacant space, a special space for housing the power circuit device 20 is not additionally required. Thus, the body 10 of the electrophotographic copying apparatus may be reduced in size in its entirety. Further, if the circuit becomes faulty and requires repair, the operator may open the lateral plate and readily remove the power circuit device 20.
  • the size of the power circuit device 20 will be more specifically described. It is now supposed that the electrophotographic copying apparatus has a width X, a depth Y and a height Z, and the power circuit device 20 has a width a, a depth b and a height c.
  • a/X is in a range from 1/5 to 1/10
  • b/Y is ina range from 4/5 to 1/2
  • c/Z is in a range from 1/2 to 1/10.
  • a/X is in a range from 4/5 to 1/2
  • b/Y is in a range from 1/5 to 1/10
  • c/Z is in a range from 1/2 to1/10.
  • air for forced forcible air cooling may be blown in the longitudinal direction of the power circuit device 20 by a fan 50 (See FIG. 3 (A)). Since the power circuit device 20 is slender, the cooling effect may be enhanced. If the power circuit device is made in the form of a cube as conventionally done, the air is screened by the power circuit device to prevent the air from efficiently flowing (See FIG. 3 (B)).
  • the present invention has been described in detail with reference to the attached drawings. However, the present invention should not be limited tothe specific embodiment above-mentioned.
  • the positions where the power circuit device 20 is incorporated in the electrophotographic copying apparatus are not limited to those in FIG. 2 (A) and (B).
  • the power circuit device may be disposed on the bottom plate of the electrophotographic copying apparatus as shown in FIG. 4 (A), or disposed inside of the apparatus as shown in FIG. 4 (B).
  • the power circuit device is disposed on the bottom of the electrophotographic copying apparatus as shown in FIG. 4 (A)
  • the effect of radiating the heat to the outside of the apparatus is particularly excellent.
  • the present invention may be varied or modified in variousmanners without departing from the scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Control Or Security For Electrophotography (AREA)
US07/441,288 1988-11-28 1989-11-27 Power circuit device for an image-forming apparatus Expired - Lifetime US5051866A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63-154603 1988-11-28
JP1988154603U JPH0275791U (US20050192411A1-20050901-C00001.png) 1988-11-28 1988-11-28

Publications (1)

Publication Number Publication Date
US5051866A true US5051866A (en) 1991-09-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US07/441,288 Expired - Lifetime US5051866A (en) 1988-11-28 1989-11-27 Power circuit device for an image-forming apparatus

Country Status (4)

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US (1) US5051866A (US20050192411A1-20050901-C00001.png)
EP (1) EP0371727B1 (US20050192411A1-20050901-C00001.png)
JP (1) JPH0275791U (US20050192411A1-20050901-C00001.png)
DE (1) DE68913014T2 (US20050192411A1-20050901-C00001.png)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5136329A (en) * 1989-12-21 1992-08-04 Canon Kabushiki Kaisha Image forming apparatus capable of utilizing excess heat
US5204755A (en) * 1988-10-31 1993-04-20 Fuji Xerox Co., Ltd. Radiator system in image recording apparatus
US5243493A (en) * 1992-04-29 1993-09-07 Industrial Technology Research Institute Fanless convection cooling design for personal computers
US5561499A (en) * 1991-07-09 1996-10-01 Canon Kabushiki Kaisha Direct electrical connection system and related method for an image forming apparatus
US5748446A (en) * 1996-12-11 1998-05-05 Intel Corporation Heat sink support
US20050053391A1 (en) * 2002-09-30 2005-03-10 Samsung Electronics Co., Ltd Apparatus for supplying voltage to developing device
US20100026087A1 (en) * 2008-07-30 2010-02-04 Matsushita Electric Industrial Co., Ltd. Power line communication apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4647323B2 (ja) * 2005-01-31 2011-03-09 京セラミタ株式会社 冷却構造およびこの冷却構造を備えた画像形成装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645333A (en) * 1984-06-01 1987-02-24 Kabushiki Kaisha Toshiba Image forming apparatus
US4674005A (en) * 1985-03-07 1987-06-16 Bendix Electronics S.A. Multiple fastening clip and device for the collective mounting of electronic power components
US4899255A (en) * 1988-07-25 1990-02-06 Motorola Inc. Heat sink clip and assembly and method of manufacture
US4905123A (en) * 1987-10-08 1990-02-27 Navistar International Transportation Corp. Heat sink bus assembly
US4911231A (en) * 1987-10-15 1990-03-27 Bicc Public Limited Company Electronic enclosure cooling system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS585392B2 (ja) * 1973-12-10 1983-01-31 セイコーエプソン株式会社 コガタゴウリカスイシヨウドケイ
DE2552682A1 (de) * 1975-11-24 1977-06-02 Gas Ges Fuer Antriebs U Steuer Gehaeuse- und kuehlkoerpersystem fuer elektronische schaltungen
DE3545253A1 (de) * 1985-12-20 1987-06-25 Philips Patentverwaltung Einrichtung und verfahren zur montage von waermeerzeugenden bauelementen in einem gehaeuse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645333A (en) * 1984-06-01 1987-02-24 Kabushiki Kaisha Toshiba Image forming apparatus
US4674005A (en) * 1985-03-07 1987-06-16 Bendix Electronics S.A. Multiple fastening clip and device for the collective mounting of electronic power components
US4905123A (en) * 1987-10-08 1990-02-27 Navistar International Transportation Corp. Heat sink bus assembly
US4911231A (en) * 1987-10-15 1990-03-27 Bicc Public Limited Company Electronic enclosure cooling system
US4899255A (en) * 1988-07-25 1990-02-06 Motorola Inc. Heat sink clip and assembly and method of manufacture

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Color Recorder, Nemoto, Japanese abstract, #62-152241, 6/18/87 filed, 12,22/88, patented.
Color Recorder, Nemoto, Japanese abstract, 62 152241, 6/18/87 filed, 12,22/88, patented. *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5204755A (en) * 1988-10-31 1993-04-20 Fuji Xerox Co., Ltd. Radiator system in image recording apparatus
US5136329A (en) * 1989-12-21 1992-08-04 Canon Kabushiki Kaisha Image forming apparatus capable of utilizing excess heat
US5561499A (en) * 1991-07-09 1996-10-01 Canon Kabushiki Kaisha Direct electrical connection system and related method for an image forming apparatus
US5243493A (en) * 1992-04-29 1993-09-07 Industrial Technology Research Institute Fanless convection cooling design for personal computers
US5748446A (en) * 1996-12-11 1998-05-05 Intel Corporation Heat sink support
US20050053391A1 (en) * 2002-09-30 2005-03-10 Samsung Electronics Co., Ltd Apparatus for supplying voltage to developing device
US7266321B2 (en) * 2002-09-30 2007-09-04 Samsung Electronics Co., Ltd. Apparatus for supplying voltage to developing device
US20100026087A1 (en) * 2008-07-30 2010-02-04 Matsushita Electric Industrial Co., Ltd. Power line communication apparatus
US8411451B2 (en) * 2008-07-30 2013-04-02 Panasonic Corporation Power line communication apparatus
US9386732B2 (en) 2008-07-30 2016-07-05 Panasonic Intellectual Property Management Co., Ltd. Power line communication apparatus
US10033164B2 (en) 2008-07-30 2018-07-24 Panasonic Intellectual Property Management Co., Ltd. Power line communication apparatus

Also Published As

Publication number Publication date
EP0371727B1 (en) 1994-02-09
DE68913014D1 (de) 1994-03-24
EP0371727A1 (en) 1990-06-06
JPH0275791U (US20050192411A1-20050901-C00001.png) 1990-06-11
DE68913014T2 (de) 1994-06-16

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